Clamp and bracket structure



2 Sheets-Sheet 1 Inveniar 21/ fliiorn/ggs B. STREZOFF CLAMP AND BRACKETSTRUCTURE Flled Aug 8 1940 Sept. 30, 1941.

Sept. 30, 19 41. STREZQFF 2257,35 4 CLAIM? AND BRACKET STRUCTURE TiledAug. 8, 1940 2 Sheets-Sheet 2 Patented Sept. 30, 1941 a UNITED STATESPATENT OFFICE mm AND BRACKET STRUCTURE Bogoia Stremif, Minneapolis,Minn. Application August a, 1940, Serial No. 351,880

4 Claims.

This invention relates to sharpening devices and is particularly adaptedfor sharpening cutting devices such as shears and knives.

It is an object of my invention to provide means for supporting andgrinding cutting instruments such as shears, hair clipper blades, andknives in such a manner that the shears blades will besupported at theproper angle for grinding the bevelled cutting edge and wherein means isalso provided for supporting thin edged blades, such as on knives, in adifferent angular position from the shears blade and wherein the knifeblade holding means can be manipulated to grind or sharpen both sides ofthe knife blade.

Another object of the invention is to provide a bracket including an armsupporting the work clamp wherein the arm is easily detachable from theremainder of the bracket and further wherein the arm can be quicklyattached to the bracket in such manner that it can be swuns relative tothe bracket.

A further object of the invention is to provide work supporting meanswhich can be moved toward or away from the grinding means to accommodatethe device to diiferent types of grinding operations.

These and other objects and advantages of the invention will more fullyappear from the following description made in connection with theaccompanying drawings, wherein like reference characters refer to thesame parts throughout the views, and, in which:

Fig. 1 is a plan view'of my invention with a shears clamp incorporatedtherewith;

Fig. 2 is an elevation thereof;

Fig. 3 is an enlarged'detail of the work holding means in section and aportion of the bracket broken away to show interior construction;

Fig. 4 is a side elevation of the knife blade clamp;

Fig. 5 is an enlarged detail similar to Fig. 3

showing the alternate positions of the knife blade clamp;

Fig. 6 is an enlarged fragmentary detail illustrating the method ofassociating the clamp supporting arm with the main bracket; and

Fig. '7 is a section taken approximately on the line 1-1 of Fig. 6.

In Figs. 1 and 2 there is shown a rotary grinding wheel 8 which has aflat upper surface and which has a supporting shaft 9 rotatably mountedin a suitable casting It and connected by gears II and I! to a shaft iswhich may be rotated by a hand crank II or by other suitable means. Thecasting III may be secured to a shelf or table I! by means of a screwclamp indicated generally at It.

A bracket I! has an end portion l8 which may be connected to the castingI. by welding or other suitable means, and said bracket l1 extendsoutwardly beneath the grinding wheel 8 and thence upwardly adJacent itsedge terminating adjacent the upper face of said grindingwheel 8. Theupwardly extending end of the bracket I1 is provided with a pair ofwings H which are bent over toward each other and in spaced relation tothe end portion of the bracket to provide a loop or guide for acooperating bracket portion 19 which extends through a loop provided bythe wings II. and the lower end of the bracket portion is is bent overas at 20 to provide a stop for limiting the forward sliding movement ofsaid bracket portion with respect to the wings It.

The upper portion of bracket member I! is provided with a roll 2', and,as best shown in Figs. 2 and '1, this roll portion terminates somedistance from the bracket 18 so that the roll portion 20 is in fact agenerally cylindrical member having a longitudinal slot from end to end.It is preferred that the rolled portion 20 not be truly cylindrical,"however, but that it have a slight frusto-conical shape for reasonstobe explained.

A work clamp supporting arm II is provided with an inner end portioncomprising a generally cylindrical but preferably frusto-conical member22, and it will be seen that the member 22 is connected to the arm 2| atits smaller end. The outer or larger end may be provided with a suitablestop member such as a flange 23. When the arm II is held in a verticalposition the frusto-conical member 22 can he slipped into the rolledbracket portion 20 and arm II will pass through the slot provided in.said rolled bracket portion. This is best brought. out in Figs. 6 and 7.When the arm 2! has been passed completely through the slot 20, theflange 23 will engage the left-hand end of the rolled portion as viewedin Fig. 6, and arm 2! will lie just beyond the right-hand end of saidfrusto-conical in shape so that when the m members are inter-engagedthey will fit relatively closely, but at the same time permitpivotalmovement of the arm 2|. g

The outer end of arm 2| is free and unconnected with the bracket or anyother supporting member so that the arm can be swung upwardly whendesired, and adjacent the outer end is a stop member 24 and said arm 2|is extended beyond the stop member to provide a relatively short armmanipulating handle portion 25.

As best shown in Figs. 1, 3 and the arm 2| is tilted on its longitudinalaxis and this tilt is provided to give the proper angular position to a4 2| on its longitudinal axis and the gripping action of the clamp. 26on said arm the shears blade will be held at a definite angle withrespect, to the grinding stone. Clamp 26 is provided with a pair offinger engaging wings 28 to assist in opening the clamp when-releasingthe work and removing said clamp from its supporting arm 2|., Tosupplement thegripping action of clamp 28' I provide a pair of loopedspring members 29 which lie over the clamp 26 adjacent its ends, and theends of the looped springs are secured to the clamp as by welding at".

In Figs. 4 and 5 there is shown a knife blade clamp 3| formed of a pieceof spring metal bent shears blade 21. Because of the tilt of the armupon itself and wherein the cooperating jaws of the clamp are normallyurged toward each other and are substantially parallel from their loweredges to a point adjacent their common upper edge. This upper edge is inthe form of substantially cylindrical roll 32 and said cylinthat othertypes arms can be substituted for ing clamps which in combination withthe arm 2| can be utilized to hold a blade such as a shears blade in adefinitely angular position relative.

tween the more nearly erect shears blade and the more nearly fiat knifeblade, the latter being illustrated in Fig. 5.

It will,'of course, be understood that various changes may be made inthe form, details, arrangement and proportions of the various partsigvirithout departing from the scope of my inven- What is claimed is:

i. In a sharpener, a rotary sharpening element having a fiat sharpeningsurface, a clamp bracket having an arm extending across the face of saidsharpening element in spaced relation thereto,

said bracket including apartially rolled portion having an edge spacedfrom the remainder of said bracket to define a slot from end to end at apoint spaced from said arm when said arm is extended 4 over' saidsharpening element parallel to said element, and said arm having asubstantially cylindrical portion slidably fitted in said rolled bracketportion, and said arm being detachable from said rolled bracket portionby axial sliding movement when said arm is positioned in alignment withsaid slot.

2. The structure in" claim 1 and said arm being tilted at an angle tosaid sharpening sur- 5. Theknife clamp 3| is provided with fingerengaging wings "similar to the wings 2| in the above described clamp,and said clamp 3| is also provided with reeniorcing springs 34 which arepositioned on and welded to the clamp in the same manner as the springs29 onthe clamp 28.

From the foregoing description it will beseen that I have produced asharpening or grinding unit with a work supportingbracket structurewhich will permit quick detachment of the arm 2| from the remainder ofthe bracket withoutbracket structure and can be' easily removed so tionand constituting a. manipulating handle,

: of said arm.

face, and a substantially V-shaped clamp removably titted over said armand closely gripping said arm to support said clamp at the tilted angleof the arm.

3. The structure in claim 1 clamp bent upon itself and stantiallytubular portion at its point of bend, the remainder of said clampconstituting closely spaced parallel faces,- and said tubular portion332g over said arm and being rotatable there- 4. The structure in claim1 and said am having a lateral projection adiacent'one end thereof, andsaid end being extended beyond said projecand a work holding includingthe suband clamp means removably positioned on said arm and alsopositioned inside of said stop means to prevent said clamp from slippingoff said end BOGOIA STREZOFF.

In addition I provide work support-

